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Vulnerability Details : CVE-2006-0459

flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.
Publish Date : 2006-03-29 Last Update Date : 2018-10-03
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access User
Vulnerability Type(s) Execute CodeOverflow
CWE ID 119

- Vendor Statements

This issue only affects parsers which are generated by grammars which either use REJECT or rules with a variable trailing context (in these rules the parser has to keep all backtracking paths). The Red Hat Security Response Team analysed all packages that include flex generated parsers in Red Hat Enterprise Linux (2.1, 3, and 4) and found none were vulnerable.
Source: Redhat

- Products Affected By CVE-2006-0459

# Product Type Vendor Product Version Update Edition Language
1 Application Will Estes And John Millaway Flex 2.5.30 Version Details Vulnerabilities
2 Application Will Estes And John Millaway Flex 2.5.32 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Will Estes And John Millaway Flex 2

- References For CVE-2006-0459
VUPEN ADV-2006-0770
XF flex-bypass-security(24995)
BID 16896 Flex Code Generation Buffer Overflow Vulnerability Release Date:2007-01-02
GENTOO GLSA-200603-07
MLIST [flex-announce] 20060222 flex 2.5.33 released

- Metasploit Modules Related To CVE-2006-0459

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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